By which of the following mechanisms can a cell transport a substance from a lower to a higher concentration?
A)simple diffusion
B)facilitated diffusion
C)active transport
D)extracellular enzymes
E)aquaporins

Question

Quizplus · Accepted Answer

Active transport is the only mechanism that can move a substance from a region of lower concentration to a region of higher concentration, which requires energy input from the cell. Simple diffusion and facilitated diffusion move substances from regions of high concentration to regions of low concentration. Extracellular enzymes are involved in breaking down molecules outside the cell, and aquaporins are channels that facilitate the transport of water molecules.

By Which of the Following Mechanisms Can a Cell Transport